00643cam a22002057a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001600102100002800118245012200146260005200268300002000320650003500340650002700375650003500402CHAP20220329141436.0971013s1965 r 00010 d a68180 a69152 a78627 cCHAP a551.45bH3800aHastings, James Rodney.14aThe changing mileb: an ecological study of vegetation change cult time in lower mile of an arid and semi arid region aTucson, Arizona :bUniversity of Arizona,c1965 a317 p.b: ilus.14aBotánicaxRegiones áridas.14aDesiertosxEcología.14aRegiones áridasxBotánica.